Roll WebGL 40d75ac..f7157c2

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/40d75ac..f7157c2

BUG=696223,715696

TEST=bots

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2844703002
Cr-Commit-Position: refs/heads/master@{#467841}

DEPS

@@ -196,7 +196,7 @@ deps = {
     Var('chromium_git') + '/external/bidichecker/lib.git' + '@' + '97f2aa645b74c28c57eca56992235c79850fa9e0',
 
   'src/third_party/webgl/src':
-    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '40d75ac0e565191d93ff3c4e8fd19f8b2df7f617',
+    Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'f7157c2751220a8f0def9f3f7f6ff37392ac83f0',
 
   'src/third_party/webdriver/pylib':
     Var('chromium_git') + '/external/selenium/py.git' + '@' + '5fd78261a75fe08d27ca4835fb6c5ce4b42275bd',

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -696,6 +696,8 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         ['linux'], bug=483282)
     self.Fail('conformance2/textures/image_bitmap_from_image/' +
               'tex-3d-r16f-red-float.html', ['linux'], bug=679695)
+    self.Fail('conformance2/textures/canvas_sub_rectangle/' +
+              'tex-2d-rgb16f-rgb-float.html', ['linux'], bug=715696)
 
     # Linux Multi-vendor failures.
     self.Skip('deqp/data/gles3/shaders/qualification_order.html',

content/test/gpu/gpu_tests/webgl_conformance_revision.txt

 # AUTOGENERATED FILE - DO NOT EDIT
 # SEE roll_webgl_conformance.py
-Current webgl revision 40d75ac0e565191d93ff3c4e8fd19f8b2df7f617
+Current webgl revision f7157c2751220a8f0def9f3f7f6ff37392ac83f0